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room addition and adding heat
we are having a 16ft by 17 ft by 8 ft high tv room addition added onto our home. I have not gotten a firm estimate of required BTUs though the range has been anywhere from 8800 to 12000. Any advice/rules of thumb/direction is appreciated on the calculation (I checked the slantfin site and am trying to use it); located in upstate ny.
my other question is the addition of the heat source. I have a two pipe vapor system/gravity return. My boiler is already large and there is room for more edr. Do most jobs of this scope add on a classic radiator like the rest found in the home or do something else like a steam baseboard or a hydronic loop with circulator? Based on my discussion with builder and the plumber it looks like up to me to get the radiator and give direction.
the existing main and returns have 1 inch supply and 3/4 inch return taps from radiators removed in the past. My initial thoughts are a radiator of 60-70 edr max would give more than enough btu and would be close to limit supplied by the 1 inch pipe. Am I close to knowing what I'm doing?